Station Antenna
Station Antenna
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Communications dish, with Canary Wharf in b/ground Photo Mugs Business communications. Part of a satellitecommunications dish antenna in Docklands, eastLondon. In the background is Canary Wharf Tower, the tallest office building in Europe..... |
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Composite image os Goldstone antenna andamp;amp; starfield Photo Mugs Composite image of the Goldstone radio dishantenna and a star field. The dish seen here is 64metres in diameter, and is used by NASA tocommunicate with spacecraft far from Earth.Notable programmes in the past include the Pioneerand Voyager missions to the outer planets.Goldstone, in California USA, is the home of theJet Propulsion Laboratory. The antenna iscurrently (early 1992) being used to supp... |
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Diameter antenna of Goldstone satellite Photo Mugs The 70-metre diameter antenna of the Goldstonesatellite tracking station, California. Goldstone, which also has 3 smaller antennae, is one of thekey stations in the Deep Space Network or DSN, NASAs worldwide spacecraft tracking acommunications complex. The DSN sends commands toa acquires data from NASAs planetary missions, such as the two Voyager spacecraft that visitedJupiter, Saturn, Uranus, a N... |
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3M 90541-80025T TEKK WorkTunes Hearing Protector and AM/FM Radio $40.74 Protect your ears while keeping yourself motivated at your job site with your favorite tunes or radio programming with the 3M TEKK 90541-80025T WorkTunes with digital tuning hearing protector, which includes an integrated AM/FM radio and a stereo input jack for connecting an MP3 player. A great choice for use on construction sites (check your local regulations), in your workshop, or in your yard w... |
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DEWALT DC012 Worksite Charger/Radio $313.52 Save time and get more done on the job site with the DEWALT DC012 Work Site Charger/Radio. This dual-function tool provides quick and efficient Lithium Ion or nicad battery charging, and a radio/MP3-plug-in function. Its rugged design stands up to the rigors of the job site, while its digital controls and advanced functions make operation simple and reliable.Work Site Charger/RadioAt a Glance:Radi... |
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Bosch PB360D Deluxe Power Box Jobsite Radio $209.99 ... |
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Ocean Potion Suncare Dark Tanning Xteme Intensifier with Instant Bronzer 8.5 fl oz (251 ml) $7.99 WIRELESS AIRDOCK 54G NETWORK USB INTERNET ADAPTER FOR APPLE MAC AirDock Mini turns any computer with an Ethernet port into a wireless capable machine, able to connect to and access Wi-Fi networks. We will include a Windows driver disk as well, so it is truely universal compatible with every computer you own The AirDock Mini lets you breathe new life in your older Mac models such as iBooks, G3's,... |
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Dantona 230Mah Li-Polymer Battery For Plantronics Headset Modern Design Practical Durable New $45.82 FM wire antenna. Preset EQ. Last channel memory. Gradual wake to iPhone, iPod, radio or alarm. Digital clock with sleep timer and snooze function. Dimmer control. 3.5mm audio input. Digital volume control. Last user settings memory. Built-in speakers. AC power: built-in AC power cable. Includes: Dock adapters for iPhone and iPod.... |
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Medialink - Wireless N USB Adapter - 802.11n - 150Mbps - 2.4ghz - Windows 2000 / 2003 / XP 32-Bit and 64-Bit / Vista 32-Bit and 64-Bit / Windows 7 32-Bit and 64-Bit Compatible $19.88 Medialink - Wireless N USB Adapter - 802.11n 150Mbps* Compatible with any Brand 802.11g or 802.11n Router Using 2.4ghz Wavelength * Microsoft WHQL Certified * Supports WEP, WPA and WPA2 Security * Live US Based Customer Service Offering the ultimate in simplified Wi-Fi installation, Medialink's 150Mbps Wireless N USB Adapter offers a simplified one click installation. Insert the CD, click "instal... |
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Panasonic SC-HC55 Compact Stereo System $109.00 (March 2011)Enjoy your favorite music from your iPod, iPhone, or CD with the SC-HC55 compact stereo system. iPhone/iPod not includedClick here for a larger image Slim, Flat Design Sleek, modern design that complements any decor. It can easily be installed in limited places, like a small bedside shelf or your desk in your home office. International CES Innovations 2011 Design and Engineering Awar... |
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Panasonic SC-HC35 Compact Stereo System $149.99 (March 2011)Enjoy your favorite music from your iPod, iPhone, or CD with the SC-HC35 compact stereo system. iPhone/iPod not includedClick here for a larger image Slim, Flat Design Sleek, modern design that complements any decor. It can easily be installed in limited places, like a small bedside shelf or your desk in your home office.Sliding Door for CD or iPod/iPhone Dock Motorized sliding door ... |
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Reecom R-1650 Weather Alert All Hazard Alert Radio with S.A.M.E and AM/FM Clock Radio $58.00 The Reecom R-1650 is a desktop weather alert radio with AM/FM alarm clock radio, all digital operations, equipped with Reecom's proprietary technology, quickly track and decode S.A.M.E. alert signals. In case of power outage which usually happens during emergency period, the R-1650 will run on back-up battery (4 'AA' size, battery not included) for more than 185 Hours in standby mode operation whi... |
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Digital Stream Analog Pass-through DTV Converter Box $44.95 Convert over-the-air digital signals so you can see them on your analog TV with this Digital-to-Analog Converter Box. Make the transition from analog to digital broadcasting with ease. The analog pass-through feature ensures that you will be able to receive signals from both analog and digital stations. New factory sealed item. Satisfaction Guaranteed. Ships immediately! What's in the box Digita... |
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PowerQ POWERHD-100 Indoor Portable Pop-Up Digital HDTV Antenna - Get FREE TV Broadcasts! $24.99 The PowerHD-100 is the first truly portable digital TV antenna that enables you to receive free off air digital broadcast stations in your area. Receive both high definition (HDTV) and standard definition (SDTV) digital programming using your existing digital TV, analog TV with converter box, or USB/PC TV tuner and laptop computer. It is a unique product in its compactness (6.5 x 2.2 x1.5 inches) ... |
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ATC New All Channel Wireless Mini Rapid Automobile Car Charger Cigarette Lighter + FM Radio Adapter Transmitter /Modulator For Apple iPod / iPhone / iTouch 3G, & 3G S / Nano / Classic / Touch / Video MP3 player, -LCD Display,Black $5.59 Specification 1. Frequency Band: FM frequency 2. Range: 88.1 ~ 107.9 MHz 3. Interval: 0.1MHz 4. Stability: -10C ~ 55C 5. Clutter & Harmonic: >= -60dB 6. Transmission distance: >=5m Compatible with-- iPod 4th Gen 20GB (Color Display), 30GB (Color Display), 60GB (Color Display), 40GB (Photo), 60GB (Photo), U2 Special Edition, 20GB, 40GB iPod Nano 1st Gen 1GB, 2GB, 4GB iPod Nano 2nd Gen 2GB, 4GB, 8GB... |
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Coby CA-745 Wireless FM Car Transmitter with Digital Display and DC Car Cigarette Lighter Adapter $17.99 Transmits Music Wirelessly from Audio Devices over FM FrequenciesLCD Display with BacklightFull Range Frequency SettingsIdeal for MP3, CD & MD Playback... |
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Ham Radio For Dummies $12.67 Itâs time we cleared the air about ham radio. If you think of it as staticky transmissions sent by people in the middle of nowhere, think again. Todayâs ham radio goes beyond wireless to extreme wireless, Operators transmit data and pictures, use the Internet, laser, and microwave transmitters, and travel to places high and low to make contact. In an emergency or natural disaster, ham ra... |
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Low Profile Amateur Radio: Operating a Ham Station from Almost Anywhere $12.68 More and more ham radio operators are faced with installing equipment and antennas amid a flurry of modern day limitations. The need to operate a low profile Amateur Radio station may be imposed by the confines of a small home or apartment. Other hams are restricted by deeds or leases that regulate the size of the antenna they can install.First edition readers will find this second edition contain... |
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The Satellite Communication Ground Segment and Earth Station Handbook $100.79 From international telephone network gateways to direct broadcast home receivers, today's broad range of ground systems and devices require satellite communication engineers and business managers to have a broad and sound understanding of the design and operating principles of earth stations and ground control facilities. This volume offers an exploration of the delivery end of the satellite link ... |
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WiFi Wireless IEEE 802.11N/G/B WLAN 54Mbps Network Dongle Adapter USB2.0 Wireless Lan USB Adapter for WiFi Wireless USB Lan Adapter Link for PSP NDS PS3 Wii Laptop Noteook Desktop PC Suport Vista/Windows 7(32bit & 64bit)/Linux $0.31 1. Support 64/128-bit WEP, complies with 128 bit WPA standard(TKIP/AES), supports MIC, IV Expansion, Shared Key Authentication, IEEE 802.1X 2. supports 150/54/48/36/24/18/12/9/6/11/5.5/2/1 Mbps wireless LAN data transfer rates 3. Quick Secure Setup, complies with WPS for worry free wireless security 4. Simple Configuration and monitoring 5. Supports Roaming technology, guaranteeing efficient wirel... |
An FM radio station broadcasts on a frequency of 95.1 MHz. What is the length of a quarter-wave antenna design
An FM radio station broadcasts on a frequency of 95.1 MHz. What is the length of a quarter-wave antenna designed to receive the signal from this station?
What is the energy associated with a photon of FM radio signal 95.1 MHz? Give answer in Joules.
wavelength (as stated above) = (2.99 * 10^8 m/s) / (95.1*10^6 Hz) = 3.14 m
1/4 of that is the length of the antenna.
Photons of that frequency have energy in Joules by the formula:
E = h * f
h is Plancks constant: 6.626 x 10^-34 J s
f is the frequency (in Hz)
E = 6.30 x 10^-26 Joules
As expected, these photons are not very energetic.
One more point: intensity, also called amplitude, of the carrier wave may be measured in 100s of thousands of kilowatts (for some commercial FM stations, effective radiated power) but that has nothing to do with the energy of each photon carrying the EM waves.
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